const webpack = require("webpack")    //  没有该插件需下载
                    module.exports = {
                      configureWebpack:{
                        plugins: [
                        new webpack.ProvidePlugin({
                          $ : "jquery",
                          jQuery : "jquery",
                          "window.jQuery" : "jquery",
                          Popper: ["popper.js","default"] 
                        })
                      ]
                    }
                  }

                  